package com.zhouhong;

/**
 * @ClassName: stack
 * @Description: 使用数组实现一个栈
 * @Author: zhouhong
 * @Create: 2021-03-30 22:37
 **/

public class ArrayStack<E> implements StackInterface<E>{

    Array<E> array;
    public ArrayStack(int capacity){
        array = new Array<>(capacity);
    }
    public ArrayStack(){
        array = new Array<>();
    }

    @Override
    public int getSize() {
        return array.getSize();
    }

    @Override
    public boolean isEmpty() {
        return array.isEmpty();
    }

    @Override
    public void push(E e) {
        array.addLast(e);
    }

    @Override
    public E pop() {
        return array.removeLast();
    }

    @Override
    public E peek() {
        return array.getLast();
    }
    public int getCapacity(){
        return array.getCapacity();
    }

    @Override
    public String toString(){
        StringBuilder res = new StringBuilder();
        res.append("Stack:");
        res.append('[');
        for (int i = 0; i < array.getSize(); i++) {
            res.append(array.get(i));
            if (i != array.getSize() - 1){
                res.append(", ");
            }
        }
        res.append("] top");
        return res.toString();
    }
}
